"There are some really cool ideas that I'm dying to tell you, but that would be giving away a secret that is not even [fully] formed yet."

Jackman explained that his contract will need to be renegotiated following the premiere of X-Men: Days of Future Past.

"I started with a two-picture deal on the first two [X-Men films], and from that point on, it's been movie by movie - not just me, but Fox and Jim and everyone," he said.

"I do want to do it with Jim and with [producer] Lauren Shuler-Donner because we had such a great experience. I'm really proud of The Wolverine."

Speaking about his commitment to playing the character, he said: "I kind of am enjoying him more than everâ€¦ Being older helps playing Wolverine. He's 200 or 300 years old - no one really knows - and he's sort of world-weary. The actual working out gets harder and harder, I'll admit."

However, he added that he may not film a new instalment straight away due to the physical demands required for the role.

"I don't want to dive into another one until we have a compelling reason to do another one," said Jackman. "I love the character, he's kind of like a best friend to me, and I don't ever want to take [him] or the fans for granted.

"I think we've got a great opportunity to make something really cool, but it has to be great. That's what we're all working toward."

X-Men: Days of Future Past will be released on May 22, 2014 in the UK, a day earlier than the US release on May 23.